10-29-2010, 07:15 PM
Hi Skip,
I would guess you would see around 150-220vdc at the cathode of the 84 tube. You could try a different audio source than the cartridge. You would use something that has a high impedance output. Say like a portable CD player.It has a low impedance output but you can raise the impedance by adding an output transformer or small filament transformer.. Use the headphone jack output into a tube type output transformer. Speaker side or 6.3v side to the phone jack/ Plate side or 120v side to the cartridge leads. I noticed that the output signal is fed back into the ac line cord. You may try flipping the plug over for best signal.
Good luck
Terry
I would guess you would see around 150-220vdc at the cathode of the 84 tube. You could try a different audio source than the cartridge. You would use something that has a high impedance output. Say like a portable CD player.It has a low impedance output but you can raise the impedance by adding an output transformer or small filament transformer.. Use the headphone jack output into a tube type output transformer. Speaker side or 6.3v side to the phone jack/ Plate side or 120v side to the cartridge leads. I noticed that the output signal is fed back into the ac line cord. You may try flipping the plug over for best signal.
Good luck
Terry
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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